This we shall find in the fact that they are all of them _message-bearing_ or _nunciative_ automatisms. I do not, of course, mean that they all of them bring messages from sources external to the automatist's own mind. In some cases they probably do this; but as a rule the so-called messages seem more probably to originate within the automatist's own personality. Why, then, it may be asked, do I call them _messages_? We do not usually speak of a man as sending a message to himself. The answer to this question involves, as we shall presently see, the profoundest conception of these automatisms to which we can as yet attain. They present themselves to us as messages communicated from one stratum to another stratum of the same personality. Originating in some deeper zone of a man's being, they float up into superficial consciousness, as deeds, visions, words, ready-made and full-blown, without any accompanying perception of the elaborative process which has made them what they are. Can we then (we may next ask) in any way predict the possible _range_ of these motor automatisms? Have we any limit assignable _a priori_, outside which it would be useless to look for any externalisation of an impulse emanating from sub-conscious strata of our being? The answer to this must be that no such limit can be with any confidence suggested. We have not yet learnt with any distinctness even how far the wave from a _consciously_-perceived stimulus will spread, or what changes its motion will assume. Still less can we predict the limitations which the resistance of the organism will impose on the radiation of a stimulus originated within itself. We are learning to consider the human organism as a practically infinite complex of interacting vibrations; and each year adds many new facts to our knowledge of the various transformations which these vibrations may undergo, and of the unexpected artifices by which we may learn to cognise some stimulus which is not directly felt. A few concrete instances will make my meaning plainer. And my first example shall be taken from those experiments in _muscle-reading_--less correctly termed mind-reading--with which the readers of the _Proceedings_ of the S.P.R. are already familiar. Let us suppose that I am to hide a pin, and that some accomplished muscle-reader is to take my hand and find the pin by noting my muscular indications.[162] I first hide the pin in the hearth-rug; then I change my mind and hide it in the bookshelf. I fix my mind on the bookshelf, but resolve to make no guiding movement. The muscle-reader takes my hand, leads me first to the rug, then to the bookshelf, and finds the pin. Now, what has happened in this case? What movements have I made?